ICES49H Datasheet – PIR Sensor – Holtek ( PDF )

Part Number: ICES49H

Package: DIP 16 Pin

Function: PIR Sensor Interface

Manufacturer: Holtek


ICES49H Datasheet

ICES49H ( = PT8A2651 )

Reference PDF :

The PT8A2651 is a CMOS LSI chip designed for automatic PIR lamp control. The chip is equipped with operational amplifiers, a comparator, timer, a zero crossing detector, control circuit, a voltage regulator, a system oscillator, and an output timing oscillator.  Its PIR sensor detects infrared power variations induced by the motion of a human body and transforms it to a voltage variation. If the PIR output voltage  variation conforms to the criteria (refer to the functional description), the lamp is turned on with an adjustable duration. The PT8A2651 offers three operating modes (ON, AUTO, OFF) which can be set through the MODE pin. While the chip is working in the AUTO mode the user can override it and switch to the quickly install mode or manual ON mode or return to the AUTO mode  by switching the power switch. The chip is enclosed in a 16 pin SOIC.


1. Operating voltage: 5V (Typical)
2. Average supply current: 120µA (Typical)
3. On-chip regulator
4. Build-in noise rejection circuit
5. 16KHz system oscillator
6. Adjustable output duration
7. Override function